From ef8f154c7cfa19db87b59ad44bab939ad810c67f Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Tue, 8 Oct 2024 15:29:48 -0700 Subject: [PATCH] tracing/kprobes: Fix symbol counting logic by looking at modules as well commit 926fe783c8a64b33997fec405cf1af3e61aed441 upstream. Recent changes to count number of matching symbols when creating a kprobe event failed to take into account kernel modules. As such, it breaks kprobes on kernel module symbols, by assuming there is no match. Fix this my calling module_kallsyms_on_each_symbol() in addition to kallsyms_on_each_match_symbol() to perform a proper counting. Link: https://lore.kernel.org/all/20231027233126.2073148-1-andrii@kernel.org/ Cc: Francis Laniel Cc: stable@vger.kernel.org Cc: Masami Hiramatsu Cc: Steven Rostedt Fixes: b022f0c7e404 ("tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols") Signed-off-by: Andrii Nakryiko Acked-by: Song Liu Signed-off-by: Masami Hiramatsu (Google) Signed-off-by: Markus Boehme Signed-off-by: Greg Kroah-Hartman [Sherry: It's a fix for previous backport, thus backport together] Signed-off-by: Sherry Yang Signed-off-by: Sasha Levin --- kernel/trace/trace_kprobe.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 91dfe8cf1..ae059345d 100755 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -742,6 +742,8 @@ static unsigned int number_of_same_symbols(char *func_name) kallsyms_on_each_symbol(count_symbols, &args); + module_kallsyms_on_each_symbol(count_symbols, &args); + return args.count; }